I'll have to check out Edge of Sanity. It sounds like we have some similar tastes, I like Death a lot too. I have Human and The Sound of Perserverance and both are excellent.
As far as Ghost Reveries, I would recommend it just on the sound quality alone. However, as far as the actual music goes it is closer to Blackwater Park than Orchid. It's still very different from their other albums though, I think all their releases have their own style and sound.
I really do recommend Deliverance. Their best back to back songs (IMO) are on that album, A Fair Judgement (I talked about this one above) and Masters Apprentices. Masters A. is very progressive and has a great HEAVY 2 minute intro with a great crunchy riff to go along with some evil as hell vocals. I can just hear him belting out "There is a DEATH I'm awaaaaatiiiiing!!!!!!!
". Great stuff.
